JPH07100616A - Device for supplying molten metal in die casting machine - Google Patents

Abstract

PURPOSE:To reduce the oxide quantity mixed in a product by fitting a flat plate-like porous plate at the lower part of a molten metal supplying device for opening/closing the molten metal supplying hole at the bottom part in a ladle with a valve rod. CONSTITUTION:The flat plate-like porous plate 15 (3-4phimm hole diameter, about 4-8mm pitch) is arranged through a supporting legs 14 by parting from the molten metal supplying hole 4 at the lower end of the ladle 1 by about 3-5mm. The lower part of the ladle 1 is dipped into the molten metal in a melting furnace and the molten metal supplying hole 4 is positioned below the molten metal surface and opened with a cylinder 6 and a valve rod 5 to introduce a certain quantity of the molten metal in the ladle 1. After dipping the molten metal, the molten metal supplying hole 4 is closed and the lower part of the ladle 1 is inserted in an injection sleeve waiting with a ladle carrying device 16 to supply the molten metal. During supplying the molten metal, the molten metal supplying hole 4 is held so as to always be below the molten metal surface in the injection sleeve and the ladle 1 is ascended while preventing the entrapment of the air. After completing the molten metal supply, the molten metal supplying hole 4 is parted from the molten metal surface and the oxide produced the molten metal surface is stuck on the upper surface of the flat plate-like porous plate 15 and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device for a die casting machine.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. Figure 5
In FIG. 2, 2 is an injection sleeve, and 3 is a plunger tip that slides in the injection sleeve 2 in the vertical direction. The ladle 1 for hot water supply has a slightly vertically long shape such that the lower end can enter the injection sleeve 2, the hot water supply port 4 is provided at the lower end, and the valve rod 5 is provided.
The hot water supply port 4 can be opened and closed. 1b is a hole through which air flows in and out.

Reference numeral 6 denotes a cylinder for moving the valve rod 5 up and down, which is mounted on the ladle 1. Reference numeral 7 is a link that rotates about the other end (not shown) as an axis, 8 is a chain wheel that is rotatably attached to the tip of the link 7 by a shaft 9,
Reference numeral 0 is a chain wound around a chain wheel 8 and another chain wheel rotatably provided at the other end of the link 7, and 11 is a bracket integrally connecting the chain wheel 8 and the cylinder 6, and the link 7 The chain wheel 8 and the chain 10 form a ladle transfer device 16.

When supplying the molten metal into the injection sleeve 2, first, the lower portion of the ladle 1 is placed in the molten metal of a furnace (molten metal holding furnace) not shown, and the molten metal inlet 4 is placed below the surface oxide film of the molten metal. Positioned, the cylinder 6 is operated to raise the valve rod 5, and a desired amount of molten metal is put into the ladle 1 from the hot water supply port 4.

When a desired amount of molten metal is pumped into the ladle 1, the cylinder 6 lowers the valve rod 5 to close the hot water inlet 4, and the ladle transfer device 16 moves the ladle 1 to move it to the state shown in FIG. As shown, the lower part of the ladle 1 is inserted into the injection sleeve 2 in the standby position. At this time, the hot water supply port 4 at the lower end portion of the ladle 1 is positioned immediately above the plunger tip 3 located below in the injection sleeve 2,
The distance was so small that air was not trapped in the molten metal as it started to flow.

[0006]

However, in the above-mentioned conventional hot water supply apparatus, it is difficult to raise the ladle 1 by following the rise of the molten metal surface.
Since it dropped from a height of m or more (from the hot water supply port 4 to the surface of the molten metal), the amount of air entrapped increased and the amount of oxides generated increased. Further, it is inevitable that the oxide film 20 on the surface of the molten metal holding furnace enters the ladle 1, and these oxide films 20 mix in the injection sleeve 2 at the time of hot water supply. As a result, oxides mix in the casting product. However, there is a problem that mechanical properties are significantly deteriorated.

[0007]

In order to achieve the above object, a hot water supply apparatus for a die casting machine according to the present invention has a hot water supply port for molten metal in a ladle at the bottom of a ladle, and the hot water supply port is moved by the vertical movement of a valve rod. In a hot water supply device for a die casting machine that opens and closes, a flat perforated plate is disposed below the molten metal supply port of the ladle, apart from the hot water supply port.

[0008]

[Function] By providing a flat plate-shaped perforated plate which is arranged below the molten metal hot water supply port of the ladle, the oxide mixed in the injection sleeve after hot water is scooped out and mixed in the cast product. Extremely reduce the amount of.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a hot water supply device for a die casting machine according to the present invention will be described in detail below with reference to the drawings.
The same reference numerals as those in the conventional example shown in FIG. 5 will not be described, and only different portions will be described.

In FIG. 1 (1), the hot water supply port 4 provided at the lower end of the ladle 1 is spaced from the hot water supply port 4 by, for example, 3 to 5 cm.
The flat plate-shaped perforated plate 15 as shown in (2) (for example, hole diameter 2
.About.4 .phi.mm, pitch 4 to 8 mm) are arranged below the hot water supply port 4 via the four support legs 14.

Further, it is necessary to stop the ladle 1 at a predetermined position in a furnace (not shown) and determine the amount of hot water supplied by the ladle 1.
It can be controlled by the action of conventionally known electrode rods 12 and 13 attached to the same. The molten metal descent limit position in the ladle 1 detected by the electrode rod 12 is shown, and when the descent limit position is detected, the valve rod 5 is lowered and the hot water inlet 4 can be closed. Further, the molten metal upper and lower limit position in the ladle 1 detected by the electrode rod 13 is shown, and when the upper and lower limit position is detected (when a desired amount of molten metal is pumped into the ladle 1), the valve rod 5 is lowered to supply hot water. The mouth 4 can be closed.

The operation of the hot water supply device of the die casting machine configured as described above will be described. When supplying a desired amount of molten metal into the injection sleeve 2, first, the lower portion of the ladle 1 is immersed together with the flat plate-shaped porous plate 15 in the molten metal of a furnace (not shown), and the hot water inlet 4 is placed on the surface of the molten metal. Positioned below the oxide film, the cylinder 6 is operated to raise the valve rod 5, and a desired amount of molten metal is put into the ladle 1 from the hot water supply port 4.

In this case, the amount of hot water supplied is determined by the vertical position of the ladle 1 with respect to the surface of the molten metal in the furnace. In order to determine the hot water supply amount, control is performed by the conventionally known electrode rods 12 and 13. After pumping the desired amount of molten metal into the ladle 1,
The action of the cylinder 6 lowers the valve rod 5 to close the hot water supply port 4,
The ladle 1 is moved by the action of the ladle transfer device 16, and the lower portion of the ladle 1 is inserted into the injection sleeve 2 at the standby position as shown in FIG. At this time, the flat plate-shaped porous plate 15 is positioned above the plunger tip 3.
In this state, the cylinder 6 is actuated to raise the valve rod 5 to open the hot water supply port 4 and start discharging the molten metal in the ladle 1 into the injection sleeve 2 (FIG. 2).

If the ladle 1 is left stationary, the molten metal is sequentially supplied from the hot water supply port 4, and accordingly, the upper surface of the molten metal in the injection sleeve 2 is located above the position of the hot water supply port 4 at the lower end of the ladle 1. When a signal (detector not shown) that the upper surface position of the molten metal in the injection sleeve 2 is slightly higher than the position of the hot water inlet 4 of the ladle 1 is emitted, the hot water inlet 4 is opened and the ladle 1 is opened. Start to rise.

When the ladle 1 is raised while the molten metal is being supplied, the ladle 1 is raised in accordance with the molten metal supply state, and the molten metal in the injection sleeve 2 is always kept at the molten metal outlet 4 and the molten metal in the injection sleeve 2. Hot water is supplied in such a state that it is placed on the top surface in sequence. At this time, the ladle 1 is set such that the upper surface of the molten metal in the injection sleeve 2 sequentially supplied from the ladle 1 is always above the hot water supply port 4 and the flat porous plate 15 is immersed in the molten metal. Continue to raise (Figure 3).

At this time, when the upper surface of the molten metal in the injection sleeve 2 is always located at the hot water supply port 4 when the ladle 1 is raised, the ladle 1 is moved up at a speed at which air is hardly entrained and the hot water supply port 4 is moved. The remaining less molten metal can be quickly discharged. Finally, the flat plate-like porous plate 15 that had been immersed until then is raised integrally with the ladle 1 from the surface of the molten metal, and the generated oxide 20 is attached to the upper surface of the flat plate-like porous plate 15 and taken out (FIG. 4). .

The oxide 20 placed on the flat plate-shaped porous plate 15 is directly blown with compressed air to blow off the oxide 20 from the flat plate-shaped porous plate 15.

[0018]

As is apparent from the above description, the hot water supply device for the die casting machine according to the present invention has the hot water supply port for the molten metal in the ladle at the bottom of the ladle, and the vertical movement of the valve rod causes the hot water supply port to move. In a hot water supply device for a die casting machine that opens and closes, a flat perforated plate is arranged below the molten metal hot water supply port of the ladle, so that the amount of oxide mixed in the cast product is extremely small. Therefore, the mechanical properties of the cast product are significantly improved, the reliability is dramatically improved, and the weight of the material can be reduced.

[Brief description of drawings]

FIG. 1 (1) shows a hot water supply device 1 for carrying out the present invention.
FIG. 2 is a vertical sectional view showing an example, and (2) is a plan view of the flat plate-like porous plate shown in (1) as seen from AA.

FIG. 2 is an explanatory diagram showing a work order of the hot water supply device according to the present invention.

FIG. 3 is an explanatory diagram showing a continuation of the operation shown in FIG.

FIG. 4 is an explanatory diagram showing a continuation of the operation shown in FIG.

FIG. 5 is a vertical cross-sectional view of a conventional hot water supply device similar to the present invention.

[Explanation of symbols]

 1 Laddle 2 Injection Sleeve 3 Plunger Tip 4 Hot Water Supply Port 5 Valve Rod 6 Cylinder 7 Link 15 Flat Plate Perforated Plate 16 Laddle Transfer Device 20 Oxide

Claims (1)

[Claims] 1. A hot water supply device for a die casting machine, which has a hot water supply port for molten metal in the ladle and which opens and closes the hot water supply port by vertically moving a valve rod, wherein a flat plate-like member is provided below the molten metal hot water supply port of the ladle. A hot water supply device for a die casting machine, characterized in that a perforated plate is arranged apart from the hot water supply port.